Yukon Charley Rivers, Alaska · field elev 867 ft
Density Altitude at Coal Creek (L20)
Coal Creek sits at 867 ft, and even a typical July afternoon (72 °F) only lifts density altitude to about 1,950 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | −15.6 | −4,274 ft | −8.6 | −3,725 ft |
| February | −9.2 | −3,772 ft | 0.5 | −3,027 ft |
| March | 0.9 | −2,997 ft | 14.7 | −1,971 ft |
| April | 25.3 | −1,208 ft | 39.5 | −217 ft |
| May | 44.9 | 151 ft | 58.9 | 1,082 ft |
| June | 56.4 | 918 ft | 71.1 | 1,868 ft |
| July | 58.9 | 1,082 ft | 72.4 | 1,950 ft |
| August | 51.8 | 613 ft | 64.8 | 1,465 ft |
| September | 40.0 | −183 ft | 52.2 | 640 ft |
| October | 18.8 | −1,673 ft | 27.4 | −1,059 ft |
| November | −4.1 | −3,378 ft | 3.9 | −2,770 ft |
| December | −12.1 | −3,998 ft | −4.5 | −3,408 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for L20
DENSITY ALTITUDE
Field elevation 867 ft — the air behaves like 1,925 ft.
- PRESSURE ALT
- 868 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Alaska fields
- CHP — Circle Hot Springs
Circle Hot Springs · elev 870 ft
- PACR — Circle City
Circle · elev 613 ft
- PACE — Central
Central · elev 937 ft
- PAEG — Eagle
Eagle · elev 907 ft
- PAAY — Chicken
Chicken · elev 1,640 ft
- PACI — Chalkyitsik
Chalkyitsik · elev 549 ft
- PAAR — Birch Creek
Birch Creek · elev 440 ft
- BYA — Boundary
Boundary · elev 2,940 ft
Frequently asked questions
How high does density altitude get at L20 in summer?
On a typical July afternoon — around 72 °F at the nearest NOAA normals station — density altitude at Coal Creek reaches roughly 1,950 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at L20 on an average day?
It swings with the seasons: from roughly −4,274 ft at the coldest month's average temperature to about 1,082 ft at the warmest month's — all from a constant field elevation of 867 ft. The month-by-month table above carries the full year.
What is the field elevation of Coal Creek?
867 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is L20 (FAA), in Yukon Charley Rivers, Alaska.